<template>
  <h2>当前求和为: {{ sum }}</h2>
  <button @click="sum++">点我+1</button>
  <hr>
  <h2>当前的信息为: {{ msg }}</h2>
  <button @click="msg += '!'">修改信息</button>
  <hr>
  <h2>姓名:{{ person.name }}</h2>
  <h2>年龄:{{ person.age }}</h2>
  <h2>薪资:{{ person.job.j1.salary }}K</h2>
  <button @click="person.name += '~'">修改姓名</button>
  <button @click="person.age++">增长年龄</button>
  <button @click="person.job.j1.salary++">涨薪</button>
</template>

<script>
import { ref, watch, reactive, watchEffect } from 'vue'
export default {
  name: 'Demo',
  setup() {
    // 数据
    let sum = ref(0)
    let msg = ref('你好啊')
    let person = reactive({
      name: '张三',
      age: 18,
      job: {
        j1: {
          salary: 20
        }
      }
    })

    // 监视
    // watch(sum, (newValue, oldValue) => {
    //   console.log('sum的值变化了', newValue, oldValue);
    // },{immediate: true})

    watchEffect(() => {
      const x1 = sum.value
      const x2 = person.job.j1.salary
      console.log('watchEffect所指定的回调执行了');
    })


    return {
      sum,
      msg,
      person
    }
  }

}
</script>

<style>
</style>
